.material_screen {
  position: absolute;
  top: 50px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, .5);
  z-index: 100;
  .live_swiper {
    top: 0;
  }
  .live_video_mask {
    top: 0;
  }
  &.hide {
    display: none;
  }
  .loading {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, .5);
    z-index: 101;
    .loading_image {
      width: 50px;
      height: 50px;
      position: absolute;
      top: 50%;
      left: 50%;
      margin-top: -25px;
      margin-left: -25px;
    }
  }
}
